What is findimg()?

[Spikedude]

I feel I've gotten a lot better at scripting over the years, but a couple of things still don't make sense to me. I was hoping some of the pros around here could give me a better explanation of findimg() in particular.

What exactly do you create by doing findimg()? I've started to notice some of the cool things you can do, but I'm still not sure why some things work. If the NPC has its own image, what are you referring to with "findimg(1)" or "findimg(100)," and is there a limit to the indexes? I'm sure I sound really stupid about this, I just haven't ever understood what I'm doing when I use findimg() in a script.

Thanks everyone!